From: Christophe Leroy <christophe.leroy@csgroup.eu> To: Benjamin Herrenschmidt <benh@kernel.crashing.org>, Paul Mackerras <paulus@samba.org>, Michael Ellerman <mpe@ellerman.id.au>, Finn Thain <fthain@linux-m68k.org>, userm57@yahoo.com Cc: linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org Subject: [PATCH] powerpc/32s: Fix napping restore in data storage interrupt (DSI) Date: Tue, 3 Aug 2021 15:14:27 +0000 (UTC) [thread overview] Message-ID: <731694e0885271f6ee9ffc179eb4bcee78313682.1628003562.git.christophe.leroy@csgroup.eu> (raw) When a DSI (Data Storage Interrupt) is taken while in NAP mode, r11 doesn't survive the call to power_save_ppc32_restore(). So use r1 instead of r11 as they both contain the virtual stack pointer at that point. Reported-by: Finn Thain <fthain@linux-m68k.org> Fixes: 4c0104a83fc3 ("powerpc/32: Dismantle EXC_XFER_STD/LITE/TEMPLATE") Cc: stable@vger.kernel.org Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> --- arch/powerpc/kernel/head_book3s_32.S | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/powerpc/kernel/head_book3s_32.S b/arch/powerpc/kernel/head_book3s_32.S index 764edd860ed4..68e5c0a7e99d 100644 --- a/arch/powerpc/kernel/head_book3s_32.S +++ b/arch/powerpc/kernel/head_book3s_32.S @@ -300,7 +300,7 @@ ALT_MMU_FTR_SECTION_END_IFSET(MMU_FTR_HPTE_TABLE) EXCEPTION_PROLOG_1 EXCEPTION_PROLOG_2 INTERRUPT_DATA_STORAGE DataAccess handle_dar_dsisr=1 prepare_transfer_to_handler - lwz r5, _DSISR(r11) + lwz r5, _DSISR(r1) andis. r0, r5, DSISR_DABRMATCH@h bne- 1f bl do_page_fault -- 2.25.0
WARNING: multiple messages have this Message-ID (diff)
From: Christophe Leroy <christophe.leroy@csgroup.eu> To: Benjamin Herrenschmidt <benh@kernel.crashing.org>, Paul Mackerras <paulus@samba.org>, Michael Ellerman <mpe@ellerman.id.au>, Finn Thain <fthain@linux-m68k.org>, userm57@yahoo.com Cc: linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org Subject: [PATCH] powerpc/32s: Fix napping restore in data storage interrupt (DSI) Date: Tue, 3 Aug 2021 15:14:27 +0000 (UTC) [thread overview] Message-ID: <731694e0885271f6ee9ffc179eb4bcee78313682.1628003562.git.christophe.leroy@csgroup.eu> (raw) When a DSI (Data Storage Interrupt) is taken while in NAP mode, r11 doesn't survive the call to power_save_ppc32_restore(). So use r1 instead of r11 as they both contain the virtual stack pointer at that point. Reported-by: Finn Thain <fthain@linux-m68k.org> Fixes: 4c0104a83fc3 ("powerpc/32: Dismantle EXC_XFER_STD/LITE/TEMPLATE") Cc: stable@vger.kernel.org Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> --- arch/powerpc/kernel/head_book3s_32.S | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/powerpc/kernel/head_book3s_32.S b/arch/powerpc/kernel/head_book3s_32.S index 764edd860ed4..68e5c0a7e99d 100644 --- a/arch/powerpc/kernel/head_book3s_32.S +++ b/arch/powerpc/kernel/head_book3s_32.S @@ -300,7 +300,7 @@ ALT_MMU_FTR_SECTION_END_IFSET(MMU_FTR_HPTE_TABLE) EXCEPTION_PROLOG_1 EXCEPTION_PROLOG_2 INTERRUPT_DATA_STORAGE DataAccess handle_dar_dsisr=1 prepare_transfer_to_handler - lwz r5, _DSISR(r11) + lwz r5, _DSISR(r1) andis. r0, r5, DSISR_DABRMATCH@h bne- 1f bl do_page_fault -- 2.25.0
next reply other threads:[~2021-08-03 15:14 UTC|newest] Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-08-03 15:14 Christophe Leroy [this message] 2021-08-03 15:14 ` [PATCH] powerpc/32s: Fix napping restore in data storage interrupt (DSI) Christophe Leroy 2021-08-04 4:04 ` Finn Thain 2021-08-04 4:04 ` Finn Thain 2021-08-04 6:07 ` Christophe Leroy 2021-08-04 6:07 ` Christophe Leroy 2021-08-04 6:21 ` Christophe Leroy 2021-08-04 6:21 ` Christophe Leroy 2021-08-04 11:36 ` Nicholas Piggin 2021-08-04 11:36 ` Nicholas Piggin 2021-08-04 13:28 ` Christophe Leroy 2021-08-04 13:28 ` Christophe Leroy 2021-08-04 14:45 ` Nicholas Piggin 2021-08-04 14:45 ` Nicholas Piggin 2021-08-05 1:54 ` Finn Thain 2021-08-05 1:54 ` Finn Thain 2021-08-13 11:57 ` Michael Ellerman
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